The codepage should be 437 (US). I think Kornel included the codepage select command in doomrl.bat to prevent high range ASCII characters from messing up. AFAIK the Latin-1 codepage (850) displays char #249 (fat centered dot) as two superscript dots, and Greek/Slavic/Cyrillic must be even worse. MS must not have been considering the millions of roguelike players out there when they pulled that stunt. ;)
In case you substituted 473 with 437 and cp select produces an error similar to "codepage not prepared", try including a the following line in your config.sys:
mode con cp prepare=((437) c:\windows\command\ega.cpi)
Edit: and of course you can use the chcp command to check/set the codepage.